I made a huge effort in my genealogy program to record ALL dates as dd mmm yyyy. And now that I have generated a GEDCOM and imported/added some of it I see that my format is being lost. It is in the GEDCOM as expected but being wrecked by WikiTree. This is one of a few unambiguous formats. The internal storage of dates makes absolutely no difference if you record it as a date number, not as a text string. The text format is only used for typing something in and printing or displaying something.
I am VERY much against any of the world's various date formats that are all numbers because of the opportunity to not know which 2 digit number is the month and which is the day. Right now, the Edit screen for a profile uses yyyy-xx-yy so you see my problem. The answer above says "But in the profile data fields, dates are displayed in the da mon year format (such as 12 Dec 2017)" but that must be old information because I see 2017-12-12, and THAT is the problem.
I would like to control how dates are formatted as part of my account settings to be used when I am logged in and looking at something or printing it out.